In one of the threads below there was a discussion of the "annunciators" used on the narrow gauge.
A few months ago I compiled a few notes and tidbits of information I had found and been sent on various types of equipment used by the D&RGW on the narrow gauge.
I compiled them into a crude and preliminary web page. Some notes on annunciators are included.
Please keep in mind this is a first cut. Anyone who has corrections or additions please send them !